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The HTTP X-Forwarded-Proto (XFP) request header is a *de-facto* standard header for identifying the protocol (HTTP or HTTPS) that a client used to connect to a proxy or load balancer.[1] The ``X-Scheme`` header was added 10 years ago, why ``X-Scheme`` was used back then and not ``X-Forwarded-Proto``, nobody knows today / possibly because ``X-Forwarded-Proto`` wasn't a *de-facto* standard back then. [1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/X-Forwarded-Proto [2] https://github.com/searx/searx/commit/6ef7c3276